Theorem sltssn 27941

Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)

Hypotheses

Ref	Expression
sltssn.1	⊢ (𝜑 → 𝐴 ∈ No )
sltssn.2	⊢ (𝜑 → 𝐵 ∈ No )
sltssn.3	⊢ (𝜑 → 𝐴 <s 𝐵)

Assertion

Ref	Expression
sltssn	⊢ (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn

Step	Hyp	Ref	Expression
1		sltssn.3	. 2 ⊢ (𝜑 → 𝐴 <s 𝐵)
2		sltssn.1	. . 3 ⊢ (𝜑 → 𝐴 ∈ No )
3		sltssn.2	. . 3 ⊢ (𝜑 → 𝐵 ∈ No )
4	2, 3	sltssnb 27940	. 2 ⊢ (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
5	1, 4	mpbird 260	1 ⊢ (𝜑 → {𝐴} <<s {𝐵})

Syntax hints:   → wi 4   ∈ wcel 2143  {csn 4590   class class class wbr 5110   No csur 27782   <s clts 27783   <<s cslts 27928

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5258  ax-pr 5406

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-br 5111  df-opab 5175  df-xp 5669  df-slts 27929

This theorem is referenced by:  cutneg  27987  zcuts  28578  twocut  28594  nohalf  28595  pw2recs  28609  halfcut  28629  addhalfcut  28630  pw2cut2  28633  bdaypw2n0bndlem  28634  bdayfinbndlem1  28638